Lock.



H. G. VOIGHT.

Locx. APPLICATION FLED JUNE 24, 1910.

973,728. V Patented 0015.251910.

3 BHEETE-SHBET 1.

Figi.

ill'

H. G. VOIGHT.

LOGK. APPLICATION FILED JUNE 24, 1910.

Z7 v l -H. G. voIGHT.

LOOK. APPLICATION FILED mlm 24, 1910.

Patented Oct. 25, 1910.

` n-uewloz Ifefarfr UNITED STATES eiarENT OFFICE.

HENRY G. VOIGHT, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO RUSSELL& EBWIN MANUFACTURING CMPANY, F NEW BRITAIN, CONNECTICUT, A CORPORATION 0F CONNECTICUT.

Specification of Letters Yatent.

` LOCK.

Patented. oet. 25,'. 1910.

Application filed June 24, 1910. Serial No. 568,623.

To all whom it may concern:

Beit known that I, HENRY Gr. VoIGH'r, a citizen of the United States, residing atNew Britain, county ot' Hartford, State of Connecticut, have invented certain new and useful Improvements in Locks, of which the y following -is a full, clear, vand exactv descrip- Achambermaid on a single lfioor, a grandmaster key .for the use of the housekeeper and adapted to 0 erat'e the locks on all floors, and a so-ca led emergency or proprietowrs key by which access may be gained to all rooms under all circumstancesand by .which the lock may be so set 'that it cannot be'operated by any but the emergency key. It is also connnon-practice to provide such locks with mechanlsmsuch as the thumb turn yoperable from the inner side, by which the latch bolt may be dead-locked against any key but the emergency key.

My lnvention contemplates improvements in Ilocks of this particular' construction 'whereby While thelolck may be operated under ordinary conditions by alll of 'the keys, it may be dead-locked against operation by the master and grand-master keys .when locked by the guest.v key or the emergency key. l

A further object of the invention is to )ro vide the lock Wi't-h mechanism operable rom the inner side,,such `as a thumb-turn, by

which the latch bolt may be dead-locked from lthe inside against ,operation by the master and ,grand-master, keys,.but may be Voperated. from the outside by a duplicate guest .key held by one of tWo occupants of a room and also by the. emergency key.

Finally, my invention contemplates mechanism by which the latch bolt may be deadlocked by the emergency key against. opera-. tion from. the outside by the duplicate guest keys as Well as the master and' 'rand-1haster keys, butin which the latch bo t may nevmrtheless be operated from the inside by the thumb-turn.

In the pmiula embodiment of m. in!

vention herein disclosed, thesame inc udes a master key for the use .of the so-called cylinder lock mechanism for operation of the latch bolt, but it is to be understood that my invent-ion is vnot confined to this particular style of lock mechanism.

c Wlth the above objects in view,V my inven tion consists in the construction and arrange lment of parts, 4a preferred .embodimentof which is illustrated in the'accompahying drawings, in whichl l Figure 1 is a side elevation idf-.the .lock witlrt-he cap or cover removed`4 and looking toward the inner side ofthe door-.,V'Fig. 2 is a sectional View on the line 2&2 Fig. 1,

llooking to the left, ii-'ith the cap `'plate and cylinder. lock mechanism in .place.fFig. ,13 isa View` similar to, F ig. .1, showing ithe dead-locking mechanism A,in .oneofv its; deadlocking positions. Fig, 4'is av-fragmentary locking 'mechanism in another of :itszideadf locking positions.. F ig/I comprisesv vaeside dead-lockingslide. Fig., 8 .comprisesaside elevation and end View respectively off the guard or emergency tumbler: of-fthe' .deadlocking sl-ifle. Fig. 9-coniprisesya-sid`e elevation and` edge view of' an` intermediate lever. cloperating -Withf .the latch operating lever. "Fig 1-0 comprisescdge:views-ofthe key controlled'cam arm ifor actuating-the dead locking slide and coperating with the guard tumblerl respectively. Figs-11, 1:2, 13 and 14 are views of .the master,f gravndmaster, .guest and emergency keys respectively.` i

In the embodiment of myinvention herein selected for illustration, 1 indicates thelock case having a face plate 2 and` .a cap plate 3 of the usual construction. .v

4 is a spring-actuated latchbolt mounted in suitable guide-Wayswithin the lokcla-se and having a stem 5 upon which ismonnted a spring 6, by lwhich the .latch boltis 'nol",

mally projected lin the usual manner.

'l' is a roll-back which coperaties spring slide 8 having 'a projection 9 engaging thecross head 1() on the Astem of the latch bolt by which `said Ilatch bolt may be retracted by operation of saidrollback 7 It is to be understood, however,that in the con- ..535 2 may be 'mov struction here shownl only the knob on the inner side of the doon is capable of operating .fltheroll-back 7,'the knob on the outer side "beinl'r idle or stationary.l 5 .fxlove' the .latch ,bolt 4 a dead-locking slide V12 is mounted pn suitable uide-ways 13 in the lock case, upon which side a latch operating lever 14 is ivoted at 15, said-lever having a stud 16 wh ch normally lies in the path of a projection 17 on the latch bolt stem. The opposite end of said latch bolt operating lever is arranged to engage' one end of a leve"z 18,pivoted at 19 also upon thedeaddocking slide 12. The opposite end '20 of said intermediate lever 18 1s arranged tov lie normallyn the path of ve cam arm 21,

r .plug 22 of a cylinder lock mechanism v2B, in the usual man-ner, whereby when said I0 eem 2 1 is rotated by h suitable key, the latch (bolt 4 may be retractedthrough the interodiate-lever 18 and the latch operating With the mechanism in the position shown 18T-'ln-v Fig. 5.1 the latchlbolt may b e retracted boltmgainst operation b .the master and.

' andfmaster e s, .the eadslocking slide Fig. 1 to athat shown in' igs. 3- a.nd 4, whereby the intermediate leverlB and latch "f -iboltvoperating lever f' 14 are'moved cnt .cf

.rangev of the rotationof the cam arm' 21 of 4.' the cylinder lock mechanism.

The dead-locki g sl'de `"s provided with a Vjshaped tumbler 24Jhaving an 'arm 25 ro# vided with a gate 26 co ratin wit a .racking stump 27, by which. sai slide is sition, as shown in Figs; 1 and 3 respectively.

This, dead-lookin operationv may be performed in three iie'rent ways, viz., bythe guest key or the emergency key from the-v 5 outer side or by" a thumb-turn on theinner side of the lock. In case such dead-locking --returned to the normal position by the .emer- .o gency key from the outsdeor by the thumburn from theinside.: .Tovetect dead-locking by the duplicate ghost key g or theenier ency key e, each of seid keysyas shown in vige. 13 and 14 re- .F1'., 2,=secured to.. the inner end of the cyl-v in e from the esition shown ovejas rear of the lock case and in alinement with the cam arms 21 of the cylinder lock mechanism 23 are the cam arms 28 and 29 rotatably mounted between the lock case and a bearing'plate (Fig. and held against accidental movement'by the spring-pressed arms 28 and 29 respectivel Each of said cam arms 28 and 29 is provlded with a keyreceiving slot 30, Fig. 1, arranged in alinement with the ke -hole slot of the cylinder lock Klug 22. T e einer ency key e, Fig. 14', w ile of greater overzl length than the master and grand-master keys, is of less overall length thanv the guest key g, and.- is adaptedw en inserted in thel cylinder lock plug to extend beyond the c linder plug onlysofar as to engage the ey-receiving slot 30 of the rotary cam arm 29 nearest t-he cylinder lock mechanism, and hence rotates only the rotary cam arm 29 in additionA to the cylinder Aplug cam 21. The cam arm 29 isarranged in the same plane with the deadlocking slide 12, whereby itinay engage the actuatingnotch 31 in said slide, to move the latter into or out of dead-locking position.

Furthermore, the tumbler 24 is'provided with an arm 32 which is likewise engaged the rotary cam arm'29 whereb said tuml" may be released from its rac ing stump 27 b said cam arm. Upon movement of the dea y -locking slide to the position shown in Fig. 3 by the caml arm 29, the intermediate latchA operating lever 18 is moved out of` ran of the cylinder lock cam 21, as a resu t of which the latch bolt cannot be operated either by the short mast-er or grandl In a s1milar manner, the dead-locking sl-ide may be movedito dead-lockinlg position by'means of the guestbfkeas fol ows: The guest key is of. sufficient overall length to 'extend htonly into the key-receivihg slot 30 of the cam arm '29, but also into the corresponding -slot of the cam arm 28 to Athe rea-r of the first, whereby both oifsaid cam arms, aswell as the cylinder lock cam 21, 'willbe rotated bythe operation of the guest key, .and thus the dead-locking slide may be I imoved to and from 'operative position by the rotation ofthe cam arm 29. The purpose of the 10am arm 28,"ouerable only by the guest key, is to preventreturn of the dead-locking slide to norma-l" inoperative position by means of thewguest'key when said slide is moved to operative'position vby the emer gency key.' To this en'd there is pivotedon thecaseat 33 beneath the dead-locking sllidea guard tumbler 84 shown detached in 8, having a spring 35, by which the free end of lsaid tumbler is normally1 lifted and held in engagement with a stop 36, Figsz and 4 in the -lock case. The free end of said guard tumbler is also slotted at 37 to receive4 a lug 38 on the rear end of the .dead-locking slide` when said ltumbler is vin its `elevs'itfd position.

vWhen the dead-locking slide is in its rearinost or normal inoperative posit-ion, Fig. 1, the lug 38 thereof lies to the rear of and outside of the slot 37, so that said guard tumbler may be rocked regardless of said lug. The rotary cam arm 28 lies in the same plane as the guard tumbler 34, and hence as said cam arm is rotated, together with the rotary Cam arm 29, by the guest key,- the tumbler will be rocked downwardly against its spring so that as the dead-locking slide 1 2 moves forward to operative position, the lug '38 on said slide, instead of taking within the slot 37 of the guard tumbler, will ride over the upper edge of said tumbler, as indicated in Fig. 3, thus permitting the rotary cam arm 28 tofmake a complete rotation and to return to its normal position, in which the key may be withdrawn from the cylinder lock. 1Vlien, however, the dead-locking slide is operated by means of the emergenc key, the rotary cani arm 28 is not rotate and hence as the, dead-locking slide moves forward to operative position, the guard tumbler 34 remains in its elevated or normal position, in which position the lug 38 of thel locking slide passes within the slot; 37 of said tumbler. Consequently, if. it is now attemptedto return the locking slide to normal position by means of the guest key, the rot-ary cam arm 28, operated 'by said key, will come into engagementwith the upper edge of thev guard tumbler, thus rigidly held inv its elevated position, whereby complete rotation of the cam arm 28 and I"consequently also of the cam arm 29 by the guest key will be prevented. Hence` -when said locking slide is moved to 'dead-locking position by the emergency key, it cannot be returned to normal position by the guest key.

Inorder that the latch bolt may be deadlocked against operation by the master and grand-master keys from the inside, a thumbturn 35 is provided on the inner Side of the j lock having a spindle which engages the hub 35 of roll-back arms 36, which overlie the lower arm 25vof the tumbler 24 'and are adapted to operate the same, and thereby actuate the deadflocking slide towhich saidV` tumbler is pivoted toZand from operative posit-ion. To this end, the lower arm 25 of the tumbler 24- is provided with a laterally projecting ledge 37, Fig. 7, which terminates in a depression 38, having the actuat ing surfaces 39 and 40 adapted to b e enf gaged' by the thumb-turn rol-l-back'arlns 36,

-whereby said tumbler may b e.released"ffrom4 the racking stumpl 37 andthe dead-loc'king slidemoved to or from operative position by said roll-back arms'. I v

In order that the dead-locking slide may be returned from operative to normal positionby means-of, one of the'duplieate guest keys after it has been moved to deadlocking position by means of the thumbturn roll-back, it is necessary that the guard tumbler 34v be moved to and held in depressed position during suoli movement of the dead-locking slide to operative position by said roll-back, so that the cam arm 28 rotated by the guest key may rotate free of the guard tumbler. To this'end the guard tumbler vis provided with a lateral projection 41 arranged in the path of rotation of the thumb-turn roll-back arms 3G, whereby as said arms rotate, the guard tumbler will be drawn downuntil during the forward movement ofthe dead-locking slide, the lug 38 wi-ll pass over the upper edge of said tumbler, thus holding said tumbler in allposit'ioii to permit free operation of the rotary camarm 28 as before described when it is desired to return the dead-lookin mechanism to inoperative or normal position by .mea-ns. of 1 the guest key. In order to prevent 'all`possi bility of jamming of the vrollsback arms 36 and the guard tumbler projection 4l during the depression of said guard tumbler by said arms, said project-i011 41 is carried at the outer end of a swinging arm 42 pivoted at -43 on the free end of said guard tumbler,

saidswingin arm beinel providedwith a spring 44 which yieldingly holds the projection 41 in proper position relative to the path of movement of the roll-back arms 36.

It. will be seen, therefore, that" the dead-l locking device may be moved by the guest keyl emergency key and thumb-turn to 4operyative position so that the latch operating levers 14 and 18 are carried entirely out of range of the cylinder plug cam 21; that when the latch is so dead-locked bythe thumb-turn it may be released therefrom` by a'duplicate guest,key as well as by the emergency key, and' when the llatch is deadlocked by eithertlie guest key orthe emergency key, it may be released therefrom by the thumb-turn and finally when the latch is dead-locked by .the emergency key it cari only be releasedtherefrom fromthe outside bythe emergency key, but it canalso be released therefrom from the inside by` the l .thumb-turn.

l`While I have yherein described a particular embodiment of my inventiomitis to be understood that-the same may be varied in detail and arrangement of parts without departing from the spirit and scope of my invent-ion.

What I claim is: z

1. In` alock, a latch-bolt, means relire.' tracting s'aidjatch bolt by a series y of'keys including a guestkey and an emergency key,

-means for dead-locking said latch bolt operable by said guest and emergency keys to prevent retraction of said latchbolt by any except said guest or emergency key, and

means to prevent retraction of the latch bolt by said guest key when dead-locked by the operation of ysaid emergency key.

. any of a series of keys inc uding a guest key u interchangeably by said guest key and saidV vranged to operate sai and an omer ency key, dead-locking means for said latc bolt operable by sald guest and emergency keys respectively to prevent retraction of said -latch bolt by any except said guest or emergencl key a roll-back ardea -locking means from the innerside of the door, means to ermit operation of said dead-locking means roll-back and to prevent release of said dead-locking means by said guest key when the latter is thrown into operation by opera# tion of said emergency key. Y

3. In a lock, a latch bolt, means 'for-retractingsaid llatch bolt b l the operation of any of aseries ofke s inc uding a guest-'key and an emergency ey, means operableby said est key and sald emergency key for, dead# ocking said latch b'olt against retracf tion by the operation of any of said keys except said guest and emergency keys re-z spectively, a roll-back operablerom'the inner side of the door to throwsaid dead-A locking means into and out of action, and means constructed and arranged. topermit the release of said dead-lockin said guest ke and said roll'- akjinterchangeably w en -thrown into action by either said guest key vor said roll-back, and means to .prevent release Vof saidv dead-locking means by said guest keywhen thrown intoaction by said emergency key andto" rmit release of said dead-locking means y said roll-back when thrown into action saidemer ncy key.. 4. In a le, a latch bolt, means for retracting said latch bolt by the operation of any of a series of keysinclud' aY .est key and an emergencykey, dea loc n means for saidl latch bolt operable by sai guest and emergency keys respectively to; .throw said latch retracting -means out ofrange of operation by the other keys of s aid series, means topernait release of said dead- 'locking means by the-'operation of said guest and emergency keys' respectively when thrown into action by said` guest 'ke and means ,to prevenf release offsaid dea locking means by the, operation key when thrown into action byf'sadjemergency key. 5. In a lock, a latch bolt,l means operable by any of a series of keys including a `ke and an en xergency key foretracting' vs ald'latch bolt,.

lke and .said emergency key-.for throwing operablelfyk said guest sald latch retracting mechanism outof range of'retraction vby allot said k s, a roll-back operable fromth'ehinner side o -the'dor for A"actuatir'lg saidA dead-locking means, means for permitting th release of said dead-locking means by sai guest key-and said rollsaid dead-lockingfs meansv byv tion by either of said members' res and to prevent release of said dea -lockingf 1 means by said guest key when throwninto.l

action by the operation'of said emergency key but to ermit release of said dead-lock# ing means y said roll-back when thrown into action bysaid emergency key.'

6. In a lock, a latch bolt, a dead-locking slide, means forretracting. said latch bolt carried by said slid'elandl operable by any of a series of keys including a guest and an emergency key when said slide is in in"- plperative p'osition,'means for' moving said ide to carry said bolt retracting mecha- 'inism-o'ut of-range of operation of all of said .keys1;whens aid slide 1s thrown into action by either 'said guest or emergency key, a rollback operable from the inner side of the- -door for actuating said'slide into and out of action, meansarranged to lpermit release of ide interchangeably vby 'said key 'and said 'rllback when i'bers, and meahs to prevent release ofsaid slide bythe operation of said guest key when thrown into action by said emergency key,l

-member therefor, bolt actuatin nriechanism carried by said member operab e by any of a Series of keys including a guest key and `anemergency key, means operable by said guest key and said emergencykey respec- .tively to actuate said member to carry said latch retracting means' out of range of operation of thekeys of -the series, a roll-back operable from the inner side of the door also to actuate said member Ato 'carry said latch retractin means out of range of operation ofthe tumbler constructed vand arranged to perthrown into-v action by either of said mem-v eys ofthe series, a guardmit actuation of said dead-locklng member to and from operative position by` said guest key/and' roll-back interchangeably and to prevent' release of said member by opera- ,tion'of said tumbler arranged to permit release o said `deadlocking member by said roll-back when thrown into action by said-emergency key.

8. In a lock, a latch bolt, a dead-locking gency key, means operable by said. guest. key

- position, means operable by said emergency ey for moving said sllde to and from opera;

to and from..operative position a guard (guest key when thrown into aci.tion by sai emergency key, saidA uard.j

to move "said slide 'to and from operative ,slide,' boltactuatingl mechanism carried by l lsaid slide andoperableby any of a; series of keys including az'guest key and an emer-i lasl tive position, a rolllback operable from the I innerside of the door for moving said slide 130v varas vent release ofsaid slide by the operation of said 'guest key when thrown into action by said emergency key, said guard tumbler be` ing arranged to slide -by said lro -back when vthrown into .action by said emergency key.-

9. In a lock, a latch-bolt, a dead-locking ,slide therefor, meansl for retracting sai emtrol'led member operable by Vsaid prevent'v return of' sait to inoperative position by said guest key latchbolt carried by said slide, a key-con'-l trolled member for actuating said bolt-retract-ing means-operable by any of a' series of keys includingla guest .key' and v`an emergencykey, a keycontrolledv member for moving 'said dead-locking shdgpinto and out of operative position operable'by said emergency key and said'guest key respectively, a ard member'for preventing release of sai slide'by said guest -key when said slide -is throwntb operatlve osition b said emergency key, a roll-bac( operab e from `the -lnner side of thedoor-to move said slide into and of operative osition, -sid guard member constructed yan larranged to be operated by said roll-:back and said guest'key oontrolledmember to permit release of said slide by operation of said roll-back and said guest key interchangeably.

10. In a.lock,`a latclrbolt, adead-locking member therefor, bolt-retracting means car- Briedb said dead-locking member, a keycontro led member operab ries of. keys for actuatin said bolt-retractmeans, a key-contro led vmember oper` ab e by said einer ency key and said guest key to aotuate sai -dead-locking member to carry said bolt-retractin means out of range of said 'first key-contro ed member, a keynest key anda member co )eratilrIr therewith to l dea-dflicking means when thrownintoaction by'said emergency lkey but to permit such return by said rollback when said dead-locking member is moved to operable positimrby said emergency key. Y,

11. Iii u lock, a latch-bolt, a dead-locking slide, latchibolt retracting meansl carried by said slide, a ln. \1onli'o|led member operable by any of a .series of keys, including a guest kev und an emergency key, to urinate said bnlt-relrm-l ing means. u ker-controlled member operable b r lsaid emergency key und "nest key respectively' lo n rluute saidrdendlin-king slide lo carry Asaid bolt-retrncting 4lucana-nul of range of said lirst key-con` trollvd mwnlnfr, a guard-tumbler adjacent rmit the release of said.

e by any of 4a se-v said dead-loc'k'ing slide operable by said emergency and guest key controlled members respectively, cperating means on said vslide and said tumbler respectivel', constructed andarranged lto prevent vrrelease of said dead-locking slide by said guest key controlled member when said slide is thrown to operative position by said emergency key controlled member. l

12. In a lock, alateh-bolt, a dead-locking member therefor, latch-retracting-means carried by said memberya key-controlled member operable by any of a series oflkeys,

including a guest key and an emergency key, toV actuate said bolt-retreating means member operable by said .emergency key.

and guest keyres ectively,'to actuate said' dead-locking mem er to move said'latchretracting means-out of 4rangefoi' said first rkey-controlled member, a roll-back operable from the inner side ofv the door likewise to actuate said dead-lockingzmember, aguard- .tumbler adjacent said dead-locking member arranged to be actuated by said guest keycontrolled member andyby said roll-'back to, permit actuation off said dead-locking member to and from operative position by operation of said guest key and said roll back interchangeably, and arranged to prevent return of said dead-locking member to." normal position by operation ofsaid guest key when thrown into actionl by saidvemergency key-controlled member, said tumble having means .controlled f by said roll-.back

to .permit said dead-locking slide' to -v'be-U moved into inoperative position by; said rollback when thrown into operative positin by saidV en'iergency key-controll`ed member..

i3. In a lock, a latch-bolt, yadead-locking. member therefor, latch-retracting'. meanscarried by said member, a key-controlled "camarm operable by a seriesof' keys, including 'a guest key and an 'emergel'icy'key to actuate said bolt-retractinfr means when-=inznor-f mal position, a'key'conti'olledf canr-arm in' line with said first armv andy operable by-'Said enlergene ke and'sa-idfg-uest key to actuate said dea -lock/ing 'slideto',carrysaidrlatch when in normal position,l a key-controlled retracting means outf'of and `into range' of 115 said iirst.keyLcontrolled-cam arm, a guardtumbler pivoted adjacent said dead-lockingl member, a third 'keyeeontrolled" "eam arm operable by said guest key, operating means on said guard tumbler and said dead-lock.

ing member to hold said tumbler in the path of said third key-controlled arm when said dead-locking member is actuatedby said emergency kcy-controlled member to pre-r vent release o said dead-locking member by said guest key but to permit return' of said dead-locking 'member by said emergency ..key.

C: y l-t. In a lock, a latch-bolt, a dead-locking member therefor, bolt-retracting means carried by said member, a key-controlled cam arm operable by any of a series .of keys to actuate said bolt-retracting means when in normal position, a key-controlled cam arm operable by said emergency key and said est key res ectively to actuate said deadibking mem r to carry said bolt-retracting means out'of and into rangeof said first key-controlled member, a guard tumbler adJacent said dead-locking member, a key-controlled cam arm operable in conjunction wit-h said emergency key-controlled cam arm by said uest key, co eratin means on said dea -locking mem rA an -said guard-tumbler respectively, arranged to hold said guard-tumbler in the path of said 'last key-controlled member when said deadlockiug member is actuated by said emerency key to prevent release of said member by said guestkey. a rollback operable from the inner side of the lock to act-uate said {lead-locking member into and out of o erative'position, means on said' guard-tum ler cooperating with said roll-back to'position sal coperating means between said tumbler and said dead-lockinor memberto perl .-"zmit of actuation. of said into and out of operative dead-locking memosition b operation of said ouest 'key an said rolinterchangeaby. 15, In a lock,-a latch-bolt, a dead-locking device therefor, latch-retracting means cartroll member operable b `any of a series of keys,l including a guest ey and an emergen'cy'key for actuating said latch-retractingjmechanism from the outer side` .of the :lock when said dead-locking device is out of action, said latchretractin means .being out of range of operation o said externally controlled means when said. dead-locking device is'in action, and means controlled by' slide,- means at the inner side of the lock for a of keys including a ,guest keyand.

P1. @emern'y throwing said slide' into or out of action, separate means carried lby said dead-lockslide arra to retractsaid latch-bolt, ngey-'controll member operable'by any of ey, coperating 'with said means by l i l latch-retracting means out of action, and operable from theouter side of the doos:only,and ooperating with said latch-retracting means only when the dead-locking slide is thrown od andjout'of action, means operable by said emergency throwing said dead-locking sli e into action from the outer side of thfe door, and means for preventing the releaseq of said dead'locking slide by said guest keywhen thrown into action by said'emergency fkey.

17. Inta lock, a latch-bolt, a rollback therefor operable Ifrom the inner side ofthe door only, a dead-locking slide, latch. bo lt reti-actin means carried by said slide, akeycontrollefgi member operule by said guest -key and vsaid emergency key respectively to move said 'dead-locking slide to carrysaid bolt-retractng meansfout of range o fksaid' first key-controlled member, a guardtum bler coperating with said' dead-locking slide, and Ineans operableonly bysaid guest key and coperating with said guard-tum-- bler to prevent release ofsaiddead-locking operation of said guest keywhen dead-loc ed by said 'emergencykey 18. In a lock, a latl1:bolt, a, .roll-back therefor operable froni' tlie'im1er .side of the door only, a dead-locking slide, bolt-retractlng means carried by said slide, akey-conf'ss trolled member operable any of a series of keys, including a guesti :ey and'. emergecly key to aetuate said dead-locking slide to carry said lbolt-actuating means outof range of said first key-controlled member, a second roll-back operable from the inner side of the door to actuate said deadlocking slideA into and out. of operative position, a

ocking slide and constructed and arranged to ermit actuation of said dead-locking sli e into and outof'operativeposition by: said guest key and'said second roll-back in'- terchange'abl and to prevent release of 'aid` 'dead-lookin'. means" by operation of 100 said guest key vw len thrown into actionby said emergency key.

HENRY G.- VOIGHT. llrit'nesses:

M. S. WIARD, M. T. N owLaNo.

indepenaenay' aff' sald means for throwing5the slide -intp and 65 key and said guest key respectively for 

